$ git clone -n https://src.fedoraproject.org/rpms/rust-grep-cli.git /var/lib/mock/f45-build-42108-788/root/chroot_tmpdir/scmroot/rust-grep-cli
Cloning into '/var/lib/mock/f45-build-42108-788/root/chroot_tmpdir/scmroot/rust-grep-cli'...
$ git fetch origin f37456cfe94d9b648b6399b240220c6fc1c47190:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-grep-cli
 * [new ref]         f37456cfe94d9b648b6399b240220c6fc1c47190 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f37456c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild